EP0432532B1 - High performance bar or wire rolling mill - Google Patents

Abstract

In a high-performance bar or wire rolling mill, especially for the single-strand twist-free rolling of rolling stock, with a roughing train 1 having in each case a plurality of roll stands or roll units, at least one intermediate train 2 and an adjoining finishing train 3 with a subsequent finishing block 4 if required, it is proposed that roll changing be carried out in accordance with the minimised sequence of passes in each mill section, the changing of the rolls in the roughing train 1 being carried out with crane tools 15, in the intermediate train 2 with manipulators 16 and in the finishing train 3 by means of rapid-change devices 17 and in addition by means of manipulators 16 if required, all the roll stands or roll units in the individual mill sections 1 to 4 having removable rolls 18, 31, 32, 46 in floating mounts in order to increase the availability and output of the rolling mill. <IMAGE>

Description

The invention relates to a high-performance steel bar / wire mill, in particular for the single-core, twist-free rolling of rolling stock.

The development of wire rod production has been very stormy in recent years through the use of new technologies such as Morgan block and Stelmor cooling devices. The maximum speed could be increased from approx. 35 m / s to over 100 m / s; the piercing cross sections were increased from 80 mm in diameter to 150 mm in diameter and the ring weights could be tripled. The consequence of this development is that it was possible to switch from four / three-core to two- or one-core lines with all the advantages in terms of the output and utilization of the production facilities. Regarding the arrangement of the rolling stands, it should be noted that the continuous horizontal arrangement was selected for normal steel grades, especially for planned multi-core rolling, both for the roughing and for the intermediate mill. With this arrangement, depending on the caliber shape, it must be twisted between the stands. The requirements placed on the surface qualities and tolerances allow such a procedure in most cases.

In cases where higher demands are made, the intermediate streets are often split and with scaffolding in a horizontal-vertical arrangement with appropriate facilities draft-free rolling. This is particularly important for the creation of garret dimensions with a good surface and tolerance.

For medium and high-alloy steels and grades with a special surface quality, a horizontal-vertical arrangement is required for the entire rolling mill, since these qualities usually no longer allow twisting. In addition, it should be mentioned that roller guides between the stands are used as far as possible to achieve a perfect surface quality.

Depending on the wire qualities to be rolled, various twist-free prefabricated block types have also been developed. The individual horizontal-vertical rolling units of the finished block have overhung carbide rolling rings.

Regarding the current state of the technical development of wire rod mills, it must be said that these have to be designed more and more to meet the special needs of the operators, because it is important to improve the efficiency of the wire rod mill and to adapt it more easily to the respective product programs, to increase the output and the To ensure high-tech quality of the product.

In the company brochure number 2000.03.86 from Danieli and C. Buttrio, IT with the title "ESC" Rolling Units, an "ESC block" with a so-called "cantilever" is described. This company brochure mentions that the ESC block can be used as a roughing stand, as an intermediate stand or as a finishing stand and that there are various options for changing the rolling rings depending on the respective application, e.g. with a semi-automatic device that is carried by a crane . In addition, the "sandwich" unit of the ESC block is to be replaced semi-automatically by a crane, the sandwich unit being prepared in the workshop set up next to the rolling mill. On page 5 of the company brochure mentioned, reference is also made to a roller change carriage, which transports the sandwich unit between the workshop and the scaffolding.

The object of the invention is to optimize the individual road sections of the steel bar / wire mill, in particular to increase their availability, to roll the wire or the bar steel in a swirl-free manner in all road sections and to reduce the plant costs through the optimized use of roll stands with certain predetermined properties.

This object is achieved with a high-performance steel bar / wire mill of the type described in claim 1. Further refinements of the high-performance rolling mill are characterized by claims 2 to 6.

According to claim 1, the roll change of the high-performance steel bar / wire mill takes place in accordance with the minimized caliber series in each section of the street, namely in the roughing train using a crane tool, in the intermediate street using a manipulator and in the finishing train using a quick-change device. Roll units in the individual road sections have overhung rollers. The design of the entire rolling mill with roll stands or rolling units with flying roll shafts on which the rolling rings are mounted allows short changeover times, ie long conversion times are not necessary, so that the mill is practically always ready for rolling. No interchangeable scaffolds are required. Due to the fact that the roll change is provided in accordance with the minimized caliber series, the roll change can be made according to the frequency and the necessity taking into account the Wear conditions and quality assurance take place, whereby the most suitable and optimally adapted to the changing process and taking into account the roll weight changing devices are used. The result shows a twist-free rolling of the rolling stock in the entire rolling mill with high availability and a rolled product with high quality and quality.

Furthermore, according to claim 1, for the purpose of swirl-free rolling of the rolling stock, the roughing and intermediate lines in an alternating sequence have horizontal-vertical compact stands. The finishing train seen in the rolling direction initially consists of horizontal-vertical compact stands, followed by a rolling block having a vertical and horizontal rolling unit, the horizontal rolling unit of which can only be used for separating the rolling stock in two separate rolling cores, while the vertical rolling unit of which is for normal rolling of the rolling stock can be used. This design of the individual road sections has several advantages: The space required for the scaffolding is minimized. The entire length of the rolling mill is reduced because the compact stands can be positioned closer together; no roller tables between the scaffolding are required. Due to the standardization of the optimized roll change, the stock of spare parts is low. The changeover times are reduced. The proposed use of a two-stand vertical-horizontal mini-block with overhung rollers is particularly advantageous as a replacement for the tilting and rotating stands previously used if, for example, the single-wire rolled rolling stock is to be subjected to a separating roller. Because in the case of separation rolling of the rolling stock, only the horizontal rolling unit of the stand is used for the separation stitch, while in the case of normal rolling only the vertical unit is in operation. The other roller unit is simply left to run empty or the corresponding roller cassette is removed.

According to the further features of claim 1, the horizontal-vertical rolling block for the last passages of the separating rolling are arranged downstream of two duo roll stands with the rolling sequence from the oval caliber to the round caliber. So if the horizontal rolling unit of the horizontal-vertical rolling block in the finishing train is used for separating rolling of the rolling stock - the vertical rolling unit of the rolling block does not perform any rolling work - each strand of the rolling stock separated into two roll cores in the horizontal stands by means of rollers with two calibers each Completely rolled so that the formed rolling stock can then be driven onto the cooling bed as finished bar steel.

An advantageous embodiment of the invention shows that the vertical-horizontal rolling block of the finishing train for the last passages of the separating rolling in the finishing train is followed by at least two compact and one vertical rolling unit (VH). The use of two two-stand compact rolling blocks for the last two passes after the rolling of the rolling stock enables the horizontal duo stands, which are arranged downstream, to be replaced. As a result, each rolling wire is rolled without twists. The entire rolling mill can therefore also be equipped with overhung roller rings in the case of separating rolling. Tungsten carbide rolling rings with a long service life can also be used. The set-up times and the maintenance times of the rolling mill can be reduced even further. The use of the compact scaffolding allows a short construction of the finishing train in the sense of a reduced space requirement.

In order to reduce the set-up times or the maintenance times in the roughing train or to increase the availability of this section of the street, according to a further proposal of the invention, a C-shaped carrier tool pivotably attached to a crane bridge is used to change the rolling rings of at least the horizontal compact stands , at the lower center of gravity of which a common changing device for the rolling rings is arranged. Since the rolling rings in this section of the road have a very high weight of about 150 to 450 kilograms, on the other hand they have a comparatively long service life of several days with a maximum permissible rolling capacity, the use of the roller changing device proposed here is optimally adapted to the rolling technology in the roughing mill, both with regard to the structural effort and the time required for the changing device.

The same advantages can be seen in the intermediate line if, in a suitable adaptation to the rolling technology, the overhung roller rings of the stands are changed with the help of a manipulator that can be moved on all sides, the head of which carries the changing device for the roller rings of the compact stands and which can be controlled manually. Since in this section of the road the weights of the rolling rings are already significantly reduced compared to those in the roughing mill, and on the other hand their average lifespan is also reduced, a changeover device is therefore provided that is easy to use by the maintenance personnel and a correspondingly quick and exact change of the processed rolling rings permits new rolling rings.

The advantage of changing the rollers in accordance with the minimized caliber series is particularly clear in every section of the finishing train, if there is another Proposal of the invention, a quick-change device is used, which has a liftable and rotatable, if appropriate, displaceably designed and arranged on a movable change carriage for the two corresponding roller rings of each vertical and horizontal stand. The rolling rings in these sections of the road are heavily stressed, among other things, because of the high rolling speed and, despite the best choice of materials such as tungsten carbide, only have an average lifespan of around one to two days with maximum rolling performance. The invention with the proposed quick-change device does justice to the need for quick and accurate roller change that can be controlled from a control room. A further improving embodiment of the invention provides that the roll changing device has at least two receiving devices which can be pivoted about its axis of rotation for an assembly frame which receives at least the rolling rings. As a result, the maintenance personnel are given the opportunity to hold new rolling rings on a building site ready for assembly, which are inserted into the receiving device of the mobile changing device. The receiving device is then pivoted accordingly and the finished rolling rings are placed on the site for further handling. Then the change car is driven back into the road section. The individual processes when changing the roll can thus be carried out using conventional control or Control elements are fully automated.

To optimize the roll change in the finishing train, it is provided that the rolling fittings can be inserted into the mounting frame and that the corresponding rolling rings can be fixed in the operating position. This results in an even more complete pre-assembly on the building site, which ultimately the roll change times are also shortened and the availability of these road sections increases. Overall, the availability of the entire steel bar / wire mill is improved. In this sense, it is also expedient if, according to a further proposal of the invention, the front plate has centering and clamping pieces for fixing the mounting frame on the front plate of the compact frame. A mounting frame designed in this regard is explained in more detail below in the special description.

Figur 1

das Lay-Out der Walzstraße,

Figur 2

die Fertigwalzstraße im Falle des Trennwalzens mit zwei Horizontal-Duo-Gerüsten,

Figur 3

die Fertigwalzstraße im Falle des Trennwalzens mit zwei Vertikal-Horizontal-Walzblöcken,

Figur 4

die Walzenwechselvorrichtung für die Vorstraße,

Figur 5

die Walzenwechselvorrichtung für die Zwischenstraße,

Figur 6

die Walzenwechselvorrichtung für die Fertigstraße,

Figur 7

den Montagerahmen für die Walzenwechselvorrichtung nach Fig. 6.

The invention is described with reference to schematic drawings for a high-performance steel bar / wire mill. Show it:

Figure 1

the layout of the rolling mill,

Figure 2

the finishing mill in the case of separating rolling with two horizontal duo stands,

Figure 3

the finishing mill in the case of separating rolling with two vertical-horizontal blocks,

Figure 4

the roll changing device for the roughing train,

Figure 5

the roller changing device for the intermediate line,

Figure 6

the roll changing device for the finishing train,

Figure 7

the mounting frame for the roller changing device according to FIG. 6.

In Fig. 1, the high-performance steel bar / rolling mill is shown with the roughing mill 1, which consists of roll stands arranged side by side in the rolling line with the stand sequence horizontal (H) / vertical (V), followed by the intermediate line 2, which are also arranged side by side Roll stands with the horizontal (H) / vertical (V) stand sequence, which is followed by finishing train 3. The finishing train 3, which is the intermediate line in the wire production, is followed by the finishing block 4 with the cooling device (not shown in more detail), usually consisting of a water cooling section with a driver / winding layer and the Stelmor system. In the case of rolling rod production, the finishing train 3 is followed by a cooling or storage bed 6.

2 and 3 show, in an enlarged detail, the finishing train 3, in which a rolling block 7, which consists of two rolling units in the sequence vertical / horizontal, follows three rolling stands with the horizontal / vertical / horizontal stand sequence. According to FIG. 2, two horizontal duo stands 8 are arranged downstream of the vertical / horizontal rolling block 7. The rollers 9 of these duo stands each have at least two calibers 10, 11. It can be clearly seen that in the horizontal roller unit 7 ″ of the rolling block 7, the rolling stock 12 is separated from a single rolling strand onto two rolling strands 12 ′, 12 ″ and each of these rolling strands in the two subsequent horizontal stands 8 one Oval / round rolling is subjected. It should be noted that in the case of separating rolling, the vertical rolling unit 7 'of the roll block 7 runs along empty or that the corresponding roll cassette is removed. In Fig. 3 it is shown that in the case of separating rolling of the rolling stock 12 with the help of the horizontal rolling unit 7 ″ of the rolling block 7, two two-stand rolling blocks 13, 14 are arranged downstream, specifically for each rolling strand 12 ′ or 12 ″. one roll block each 13 and 14. Each roll block 13, 14 has two roll units 13 ', 13''; 14 ', 14''in the vertical / horizontal roller sequence.

The tilting or rotating stands usually used at this point are replaced by the vertical / horizontal rolling block 7 in the finishing train 3. The horizontal duo stands shown in FIG. 2 are replaced by the vertical / horizontal rolling blocks 13, 14.

All of the rolling stands in the rolling mill, in particular according to FIG. 1 in connection with FIG. 3, have overhung shafts on which the rolling rings are mounted. This opens up the possibility of changing the rolls in accordance with the minimized caliber series in each section of the road, namely in the roughing train using crane tools (Fig. 4), in the intermediate train using manipulators (Fig. 5) and in the finishing train using quick-change devices (Fig. 6) .

According to FIG. 4, the crane tools 15 for changing the rolling rings 18, in particular the horizontal stands (FIG. 4) in the roughing street 1, consist of a C-shaped carrier tool 19 which is pivotably suspended on a crane bridge 20. In the lower center of gravity of the carrier tool, a handwheel-operated roll changing device 21 is arranged, which receives the corresponding roll rings 18 of the roll stand together. For this purpose, a lever system 22 is provided with an end projection 23 which engages in the caliber 24 of the rolling rings 18 when the handwheel is rotated and the guide nut 25 is thus moved longitudinally. The roll changing device 21 'for the rolling rings of the vertical stands can, for example, be of the conventional design Ropes of a crane are raised (Fig. 4b). In the simplest version it is also possible that the crane cables can be attached directly to the roller rings (Fig. 4c).

FIG. 5 shows the use of a manipulator 16 for changing the rolling rings 31, 32 of a vertical compact stand 33 (FIG. 5a) or a horizontal compact stand 34 (FIG. 5b) in the intermediate street 2. The manipulator 16 is on a carrier bridge 26 attached, and connectable to a hydraulic system, not shown. The manipulator usually consists of joint systems 27, 28, so that the head 29 of the manipulator, which carries the changing device 35 for the roller rings 31, 32, can be moved on all sides. The head 29 of the manipulator 16 can be controlled by the operating personnel in each direction of movement with the aid of a control lever 30, so that the rolling rings 31, 32 are pulled off the respective rolling stand in the shortest possible time and can be exchanged for new rolling rings 31 'or 32', respectively store the site 36 prepared.

A quick-change device 17, which is shown in FIG. 6, is provided for changing the rolling rings 46 in the finishing train 3. The quick-change device 17 consists of a change carriage 37, which can be moved by a piston-cylinder linkage 38 on a conventional rail arrangement between the roll stands 42, 43 and a construction site 39. The changing device has a lifting and rotating mounting device 40, the movement of which is indicated by arrows and which, according to FIG. 6a, has two diametrically opposite roller carriers 44, each with a receiving opening 41 at least for the corresponding roller rings 46 of the vertical compact stand 42 The receiving opening can thus carry the finished rolling rings of the roll stand 42, while the other receiving opening the new rolling rings prepared on site 39. The receiving device 40 for the roller rings of the horizontal compact stand 43 is designed somewhat differently according to FIG. 6b, in that the two opposite roller carriers 44 on the change carriage can be moved so far according to the movement arrow that there is sufficient space for mounting or dismounting the roller rings if the receiving device 40 is rotated accordingly on the change carriage.

A particularly advantageous mounting system is shown in FIG. 7, namely a mounting frame 45 which can be inserted into the receiving openings 41 of the quick-change device 17 in FIG. 6. The corresponding roller rings 46, 46 'are fixed in the mounting position 45 in the installation position and thus in the operating position. In addition, the rolling fittings 47, 47 'of the inlet and outlet sides are firmly inserted in the mounting frame. The rolling rings are fixed in the installation position with the aid of a conventional and therefore not shown lever system, the mounting hooks 48, 48 'of which are placed on the circumference of each rolling ring or on the caliber of the rolling ring for secure positioning. Centering pieces 49 and clamping devices 50 are provided on the front plate 52. These measures serve to center and fix the assembly frame on the front plate of the respective compact stand of the finishing train 3. With the help of the assembly frame 45 according to FIG. 7, the quick-change device shown in FIG. 6 can be used even more effectively for the rolling rings.

It could be shown that the measures claimed increased the availability of a bar and wire rod mill with high output and excellent product quality, if primarily in all road sections Roll stands or rolling units with cantilevered shafts and removable roll rings are used and if the design of the roll changing devices is precisely matched to the need and frequency of the roll changing conditions.

List of reference numbers

1

Vorstrasse

2nd

Intermediate street

3rd

Finishing train

4th

Finished block

5

Cooling line

6

Cooling / storage bed

7

Mill block

7 '

Vertical rolling unit

7 ''

Horizontal rolling unit

8th

Horizontal duo scaffold

9

Rollers

10th

Oval caliber

11

Round caliber

12th

Rolling stock

12 '

Rolled stock

12 ''

Rolled stock

13

Mill block

13 '

Vertical rolling unit

13 ''

Horizontal rolling unit

14

Mill block

14 '

Vertical rolling unit

14 ''

Horizontal rolling unit

15

Crane tool

16

manipulator

17th

Quick change device

18th

Rolling ring

19th

Carrier tool

20th

Crane bridge

21

Exchange device

21 '

Exchange device

22

Lever system

23

head Start

24th

caliber

25th

Guide nut

26

Girder bridge

27, 28

Joint system

29

Manipulator head

30th

Control lever

31, 32

Roll rings

33

Vertical compact frame

34

Horizontal compact scaffold

35

Roller changing device

36

Building site

37

Exchange car

38

Piston-cylinder linkage

39

Building site

40

Reception facility

41

Receiving opening

42

Vertical compact frame

43

Horizontal compact scaffold

44

Roller carrier

45

Mounting frame

46, 46 '

Roll rings

47, 47 '

Roll fittings

48

Assembly hook

49

Centering pieces

50

Clamping device

51

Axis of rotation

52

Front panel

Claims (6)

1. High capacity bar and wire rolling mill, particularly for twist-free rolling of roll stock (12), with a roughing train (1), at least one intermediate train (2) and an adjoining finishing train (3) optionally with a following finishing block (4) each comprising several roll stands or roll units, wherein in accordance with the minimised groove sequence in each train section the roll change in the roughing train (1) is effected by means of a crane tool (15), in the intermediate train (2) by means of a manipulator (16) and in the finishing train (8) by means of a quick-change device (17) and optionally also by means of a manipulator, and all roll stands or roll units in the individual train sections (1, 2, 3, 4) have overhung mounted, removable rolls (18, 31, 32, 46), wherein further the roughing and intermediate trains (1, 2) have horizontal stands and vertical stands (H-V) in alternating sequence for the purpose of twist-free rolling of the stock (12) to be rolled and the finishing train (3) consists, seen in rolling direction, at least of horizontal stands and vertical stands (H-V) followed by a roll block (7) comprising a vertical roll unit and a horizontal roll unit (V-H), the horizontal roll unit (H) of which is usable exclusively for the rolling separate of the roll stock (12) into two separate bars (12', 12'') whilst the vertical roll unit (V) of which is usable for normal rolling of the roll stock, and wherein two two-high roll stands (8) with the roll sequence of oval groove to round groove are arranged downstream of the vertical-horizontal roll block (7) in the finishing train (3) for the last pass of the rolling separate in the finishing train.
2. Rolling mill according to claim 1, characterised thereby that at least two compact roll blocks (14), which each comprise a vertical roll unit and a horizontal roll unit (V-H), are arranged downstream of the vertical-horizontal roll block (7) of the finishing train (3) for the last pass of the rolling separate in the finishing train.
3. Rolling mill according to claim 1 or 2, characterised thereby that a carrier tool (19), which is bent to be C-shaped, is pivotably attached to a crane bridge (20) and at the lower centre of gravity of which is arranged a common exchange device (21) for the roll collars (18) at least of the horizontal stands, can be brought into action in the roughing train (1), wherein a manipulator (16), which is movable in all directions, is manually controllable and the head (29) of which carries the changer device (35) for the roll collars (31, 32) of the stands (33, 34), is arranged in the intermediate stand (2), and wherein a changer device (17), which is equipped to be raisable and rotatable and optionally slidable and is arranged on a movable changer carriage (37), for the two corresponding roll collars (46) of one of each vertical and horizontal stand (42, 43) can be brought into action in the finishing train (3).
4. Rolling mill according to claim 1, 2 or 3, characterised thereby that the roll change device (17) comprises two receiving equipments (40), which are pivotable about the rotational axis (51) of the device, for a mounting frame (45) receiving at least the roll collars.
5. Rolling mill according to claim 4, characterised thereby that the roll fittings (47) are insertable into the mounting frame (45) and the corresponding roll collars (46, 46') are fixable in operating position.
6. Rolling mill according to claim 4 or 5, characterised thereby that the front plate (52) has centring and clamping members (49, 50) for fixing the mounting frame (45) on the front plate (52) of the compact stand (42, 43).

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